Peptide Reconstitution Calculator
Peptide reconstitution calculator works out Concentration and Dose from Peptide in the vial, Diluent added (bacteriostatic water) and Dose per injection. The default figures on this page give syringe mark of 10.00 units; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
5 steps
- Concentration = 5 mg / 2 mL = 2.5 mg/mL (2500 mcg/mL).
- Dose = 250 mcg = 0.25 mg.
- Volume to draw = 0.25 mg / 2.5 mg/mL = 0.1 mL.
- U-100 syringe: 0.1 mL x 100 units/mL = 10 units.
- Doses per vial = 5 mg / 0.25 mg = 20.
Its 4 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
3 sources
What the peptide reconstitution calculator calculates
Works out the concentration of a reconstituted peptide vial, the volume and insulin-syringe unit mark for a given dose, how many doses the vial holds and how long it lasts.
How to use this peptide reconstitution calculator
Enter Peptide in the vial, Diluent added (bacteriostatic water), Dose per injection and Dose unit. Concentration updates as you type, and “Use a worked example” loads checked figures you can adjust. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Concentration, Dose and Volume to draw.
The method follows IUPAC Compendium of Chemical Terminology ("Gold Book"), mass concentration - the mass of a component divided by the volume of the mixture, FDA-approved labeling, Humulin R U-100 (NDA 018780) - "100 units/mL (U-100)"; the basis for the 100-graduation-per-millilitre insulin syringe scale and USP General Chapter <797> Pharmaceutical Compounding - Sterile Preparations: reconstitution must follow the manufacturer's labelled diluent and volume.
5 mg vial in 2 mL, 250 mcg dose on a U-100 syringe example
With Peptide in the vial: 5, Diluent added (bacteriostatic water): 2, Dose per injection: 250, Dose unit: mcg, the calculator returns Concentration: 2.5, Concentration: 2500, Volume to draw: 0.1. This example is checked against an independent source in the test suite.
What you can compare
Change one input at a time to see how it affects Concentration, Dose and Volume to draw. The inputs you can vary are Peptide in the vial, Diluent added (bacteriostatic water), Dose per injection, Dose unit, Syringe graduation and Syringe barrel capacity.
Understanding Concentration, Dose and Volume to draw
Preparation arithmetic only. It is not a dose recommendation and does not check the drug, its stability, the diluent or the route. Every reconstitution and dose must be confirmed by the prescribing clinician or pharmacist against the product labelling before use.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
How to calculate peptide reconstitution?
Works out the concentration of a reconstituted peptide vial, the volume and insulin-syringe unit mark for a given dose, how many doses the vial holds and how long it lasts. Open “How this is worked out” beside the result to see each step for your own figures.
How to reconstitute 30 mg of peptide?
It needs Peptide in the vial, Diluent added (bacteriostatic water), Dose per injection, Dose unit, Syringe graduation and Syringe barrel capacity. Nothing else is required, and the figures stay in your browser.
How do you calculate reconstitution?
The result gives Concentration, Dose, Volume to draw, Syringe mark, Syringe capacity and Doses per vial, each labelled with its unit so the figure can be read on its own.
How to calculate reconstitution of peptides?
The page opens with worked default figures: syringe mark of 10.00 units. Replace them with your own and every figure updates as you type.
What information do I need for the peptide reconstitution calculator?
You need Peptide in the vial, Diluent added (bacteriostatic water), Dose per injection, Dose unit, Syringe graduation, Syringe barrel capacity and Injections per week. The page opens with default figures that give syringe mark of 10.00 units, so you can see the scale before entering your own.
What does this peptide reconstitution calculator show?
It shows Concentration, Dose, Volume to draw, Syringe mark, Syringe capacity, Doses per vial, Whole doses per vial and Peptide in the vial, with the working and any warnings for your entries.